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Im using Mike Lanes hat with 3 of the same 3 meter sensors and no issues. It uses 3.3v and a 4.7k pullup built in to the board. On the board are 3 jst xh connectors all paralleled to each other.Well if you are using Michael's hat then bulk of these suggestions wont apply, i guess
Great insights . I didn’t notice these probes are being hot plugged. I have no experience with that. I agree that one bad probe /connector can impact the entire one wire bus. I think isolating the problem and get to the bottom of it is key. And as you mentioned plugging them one by one and power cycling in between is a very systematic approach to get to thatIm using Mike Lanes hat with 3 of the same 3 meter sensors and no issues. It uses 3.3v and a 4.7k pullup built in to the board. On the board are 3 jst xh connectors all paralleled to each other.
Sensors arent showing up, and he had trouble with them giving 0 C(32F) readings for a time which points to sensor communication issues. Since all that was done was hot plugging them in and out I doubt anything is permanently damaged, especially as he had them working for a short time after. I suspect a wiring issue in the xlr connectors
Do some continuity checks with everything POWERED DOWN and unplugged from the hat. Check your continuity from the board jst connectors to your xlr connectors in the housing. Its easy to mess up when soldering and overheat the pins where they may not be lining up correctly and not mating every time the connector is plugged in.
If your meter has a diode test mode, check at the sensor xlr connectors to see if the sensors are ok with this test.
To check the DS18B20 with a multimeter, choose the "diode testing" mode, and put the positive testing lead to the white wire (GND) of the sensor. The voltage between white wire (GND) and the red wire (VDD) should be around 0.59V ~ 0.63V; the voltage between white wire (GND) and the yellow wire (DATA) should slightly lower, around 0.49V ~ 0.55V.
That may tell you if you have a connector issue on the sensor cable end of the xlr mates. If this test goes ok, then plug the sensors in to the xlr jacks and do the same test at the board jst connectors.
Another suggestion is to try the sensors one at a time instead of plugging in all 3 at once, maybe one sensor is miswired but since they all plug into the same 'bus', maybe one sensor is taking the others down.
Did a bunch of testing and found several faulty solder points, my guess is me being unable to really get the tip of the iron I'm using on the connector is causing the issue. I'm just not getting an actual bond between the wire and the connector. It's probably an actual lack of experience on my part combined with the larger tipped iron that's causing me problems but I'm going to order an iron that has smaller tips available and try that. I appreciate all the insight and help guys.